package com.example.community.controller;

import com.example.community.annotation.LoginRequired;
import com.example.community.entity.User;
import com.example.community.service.UserService;
import com.example.community.util.CommunityUtil;
import com.example.community.util.HostHolder;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;

@Controller
@RequestMapping("/user")
public class UserController {

    private static  final Logger logger= LoggerFactory.getLogger(UserController.class);
    @Value("${community.path.upload}")
    private String uploadPath;
    @Value("${community.path.domain}")
    private  String domain;
    @Value("${server.servlet.context-path}")
    private  String contextPath;

    @Autowired
    private UserService userService;

    @Autowired
    private HostHolder hostHolder;

    @LoginRequired
    @RequestMapping(path = "/setting",method = RequestMethod.GET)
    public  String getSettingPage(){
        return  "/site/setting";
    }
    @LoginRequired
    @RequestMapping(path = "/upload",method = RequestMethod.POST)
    public String uploadHeader(MultipartFile headerImage, Model model)  {
        if (headerImage==null){
            model.addAttribute("error","您还没有选择图片!");
            return "/site/setting";
        }

        String fileName=headerImage.getOriginalFilename();
        String suffix=fileName.substring(fileName.lastIndexOf("."));
        if (StringUtils.isBlank(suffix)){
            model.addAttribute("error","文件的格式不正确!");
            return "/site/setting";
        }
        //生成随机文件名
        fileName = CommunityUtil.generateUUID()+suffix;
        //确定文件存放的路径
        File dest=new File(uploadPath+"/"+fileName);

        try {
            headerImage.transferTo(dest);
        } catch (IOException e) {

            logger.error("上传文件失败: "+e.getMessage());
          throw new RuntimeException("上传文件失败,服务器放生异常!",e);
        }
//更新当前用户的头像的路径(web访问路径)
        User user=hostHolder.getUser();
        String headerUrl=domain+contextPath+"/user/header/"+fileName;
        userService.updateHeader(user.getId(),headerUrl);
        return  "redirect:/index";
    }

    @RequestMapping(path = "/header/{fileName}",method = RequestMethod.GET)
    public void getHeader(@PathVariable("fileName")String fileName, HttpServletResponse response){
        //服务器存放路径
        fileName=uploadPath+"/"+fileName;
        //文件后缀
        String suffix=fileName.substring(fileName.lastIndexOf("."));
        //响应图片
        response.setContentType("image/"+suffix);
        try ( FileInputStream fis=new FileInputStream(fileName);
              OutputStream os=response.getOutputStream();){
            byte[] buffer=new byte[1024];
            int b=0;
            while ((b=fis.read(buffer))!=-1){
                os.write(buffer,0,b);
            }

        }catch (IOException e){
            logger.error("读取头像失败: "+e.getMessage());
        }
    }
}
